Due to hydraulic presses consist of lots of largescale parts, the 3D printing technology can decrease the development cycle and reduce the manufacturing cost in new product development, sales presentation, and teaching experiments. The three beam fourpost hydraulic press was taken as an example, and aimed at requirements as mechanical strength, stiffness, stability, practicability and materialsaving of the 3D printing model, some structure design problems such as model structure optimization, model structure split print and supporting structure optimization were analyzed, the structure design requirements suitable for 3D printing models of hydraulic presses were presented.